#include <stdio.h>
#include <unistd.h>

int main()
{
    pid_t id = fork();
    if (id == 0)
    {
        // child
        while (1)
        {
            printf("chlid\n");
            sleep(1);
        }
    }
    else
    {
        // father
        int cnt = 3;
        while (cnt)
        {
            printf("father: %d\n", cnt--);
            sleep(1);
        }
    }
    return 0;
}
